Figure 5From: Orthogonal beamforming using Gram-Schmidt orthogonalization for multi-user MIMO downlink systemSum capacity comparison among the proposed method, LF-OSDMA, and the extended LF-OSDMA for an increase of the number of users K ; SNR = 5 dB; S is the number of users selected by the base station, M is the number of subcodebooks, and the number of transmit antennas is N t = 4.Back to article page